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United States Patent | 5,046,324 |
Otoh ,   et al. | September 10, 1991 |
A defrosting controller for use with a refrigeration system determines calculating a frost melting period from the measurements of the evaporator temperature during defrosting by means of an evaporator temperature sensor, establishes a refrigerating operation rate which is the ratio of the period of the frost melting process to the (total) open period of an electronic motor-driven valve during the refrigeration, and then decides whether the next defrosting operation is to be skipped or not.
Inventors: | Otoh; Tadao (Ohta, JP); Ishida; Yoshihisa (Gunma, JP); Ohya; Satoshi (Gunma, JP); Ishiguro; Masaki (Ohta, JP) |
Assignee: | Sanyo Electric Co., Ltd. (Osaka, JP) |
Appl. No.: | 541886 |
Filed: | June 20, 1990 |
Current U.S. Class: | 62/155; 62/156 |
Intern'l Class: | F25D 021/06 |
Field of Search: | 62/154,155,156,234,140 |
4156350 | May., 1979 | Elliott et al. | 62/155. |
4173871 | Nov., 1979 | Brooks | 62/155. |
4297852 | Nov., 1981 | Brooks | 62/155. |
4528821 | Jul., 1985 | Tershak et al. | 62/156. |
4938027 | Jul., 1990 | Midlang | 62/156. |